Oxygen minimum zone in the North Atlantic south and east of the Cape Verde Islands.

Stramma, Lothar , Brandt, Peter , Schafstall, Jens, Schott, Friedrich, Fischer, Jürgen and Körtzinger, Arne (2008) Oxygen minimum zone in the North Atlantic south and east of the Cape Verde Islands. Open Access Journal of Geophysical Research: Oceans, 113 . C04014. DOI 10.1029/2007JC004369.

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Abstract

The open-ocean oxygen minimum zone (OMZ) south and east of the Cape Verde Islands is studied from CTD hydrography, ADCP velocities, Argo float trajectories, and historical data, with a focus on the zonal supply and drainage paths. The strongest oxygen minimum is located north of the North Equatorial Countercurrent (NECC) at about 400 to 500-m depth just above the boundary between Central Water and Antarctic Intermediate Water (AAIW). It is shown that the NECC, the North Equatorial Undercurrent at 4 to 6°N, and a northern branch of the NECC at 8 to 10°N are the sources for oxygen-rich water supplied to the OMZ in summer and fall. A weak eastward NECC at 200-m depth also exists in winter and spring as derived from Argo floats drifting at shallow levels. Historical oxygen data from 200-m depth confirm this seasonality showing high (low) oxygen content in summer and fall (spring) within the supply paths. Compared to the strong oxygen supply at 150 to 300-m depth, the ventilation of the OMZ at 300 to 600-m depth is weaker. Westward drainage of oxygen-poor water takes place north of the Guinea Dome, i.e., north of 10°N, most pronounced at 400 to 600-m depth. In July 2006 the total eastward transport of both NECC bands above σ θ = 27.1 kg m−3 at 23°W was about 13 Sv (1 Sv = 106 m3 s−1). About half of this water volume circulates within the Guinea Dome or recirculates westward north of the Guinea Dome.

Document Type: Article
Additional Information: “An edited version of this paper was published by AGU. Copyright (2008) American Geophysical Union.” “Lothar Stramma, Peter Brandt, Jens Schafstall, Friedrich Schott, Jürgen Fischer, and Arne Körtzinger, (2008), Oxygen minimum zone in the North Atlantic south and east of the Cape Verde Islands, JGR, 113, C04014 doi:10.1029/2007JC004369. To view the published open abstract, go to http://dx.doi.org and enter the DOI.” “Not subject to U.S. copyright”. WOS:000255077300003
Keywords: Oceanography; Sauerstoff, Wassermassen, Nordatlantischer Gegenstrom, Sauerstoffminimumzonen, Kapverden; TROPICAL ATLANTIC; EQUATORIAL ATLANTIC; SURFACE CIRCULATION; SEASONAL CYCLE; ALTIMETER DATA; HEAT FLUXES; OCEAN; VARIABILITY; FLOW; COUNTERCURRENT
Research affiliation: OceanRep > SFB 754 > A5
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > SFB 754 > A4
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2007JC004369
ISSN: 2169-9275
Projects: SOPRAN, SFB754, Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 03 Dec 2008 16:50
Last Modified: 24 Apr 2018 13:35
URI: http://oceanrep.geomar.de/id/eprint/5037

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